In the terminal:
$ sudo gedit ~/.bashrc
And enter this lines at the end of the file or anywhere really.
# Add color to Bash prompt symbols
PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ 'Save the file and close the terminal. Next time you restart the terminal the bash will be in a different color.